Final answer:
To maximize her profit, the potter should make 250 plates.
Step-by-step explanation:
In order to maximize her profit, the potter needs to determine the number of cups and plates she should make within the given time and amount of clay.
First, let's calculate the time it takes to make one cup and one plate: 6 minutes for a cup and 3 minutes for a plate.
Next, let's calculate the number of cups and plates she can make within the available 20 hours:
(20 hours x 60 minutes) / 6 minutes per cup = 200 cups
(20 hours x 60 minutes) / 3 minutes per plate = 400 plates
Now, let's calculate the amount of clay required to make the cups and plates:
200 cups x 3/4 lb of clay per cup = 150 lbs of clay for cups
400 plates x 1 lb of clay per plate = 400 lbs of clay for plates
She can only make 250 lbs of clay, so she should use all the clay to make plates:
250 lbs of clay / 1 lb of clay per plate = 250 plates
Therefore, the potter should make 250 plates in order to maximize her profit.